Definition of unspeakably adverb from the Oxford Advanced Learner's Dictionary

 

unspeakably

 adverb
adverb
BrE BrE//ʌnˈspiːkəbli//
 
; NAmE NAmE//ʌnˈspiːkəbli//
 
(literary, usually disapproving)
 
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in a way that cannot be described in words, usually because it is so bad synonym indescribably The man was an unspeakably awful human being: a monster.